Taiwan Semiconductor Corporation S2K

Overview

S2K from Taiwan Semiconductor is a standard surface-mount silicon rectifier diode with 800 V repetitive peak reverse voltage (VRRM), 2 A average forward current (IF), and DO-214AA (SMB) package - used as primary-side AC/DC rectification in offline switch-mode power supplies and industrial adapters.

For engineers reviewing the S2K datasheet, S2K pinout, S2K application, or S2K equivalent, key selection criteria include its 800 V VRRM rating, 50 A surge capability (IFSM), 1.15 V max forward voltage at 2 A, 1 µA max reverse leakage at 25°C, and SMB-packaged single-die construction for high-reliability 230 VAC input stages.

Technical Context

The S2K is a single-die, glass-passivated PN junction rectifier optimized for general-purpose switching-mode power conversion. It operates across -55°C to +150°C junction temperature range and features low thermal resistance (R_θJL = 16°C/W) for efficient heat transfer to PCB copper.

Its 1500 ns reverse recovery time (trr) and 30 pF junction capacitance at 4 V bias indicate suitability for medium-frequency (<100 kHz) rectification where soft recovery and EMI control are secondary to robustness and cost efficiency.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount, single-anode/single-cathode configuration with cathode band marking. Matte tin-plated leads, moisture sensitivity level 1 (J-STD-020), UL 94V-0 molding compound.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar standard rectifier applications.

Compared with STTH2R08 and ES2J, the S2K offers optimal balance of 800 V ruggedness, 1.15 V low VF, and cost-effective standard recovery performance - making it preferred for mainstream 230 VAC offline SMPS where EMI and switching loss are less critical than reliability and thermal margin.

Availability

S2K is available at Aetrix Electronics and suitable for industrial power adapters, LED driver secondary rectification, and offline SMPS front-end designs requiring stable component supply and long-lifecycle availability.

Supply support for S2K includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Taiwan Semiconductor Corporation (TSC) is a vertically integrated Taiwanese manufacturer specializing in discrete semiconductors, including rectifiers, TVS diodes, MOSFETs, and bipolar transistors - serving industrial, computing, and consumer markets since 1979.

The S2K belongs to TSC's S2x series of standard surface-mount rectifiers designed specifically for cost-sensitive, high-volume AC/DC power conversion where proven ruggedness, JEDEC-compliant packaging, and J-STD-020 Level 1 handling are essential.

FAQ

What is the maximum repetitive peak reverse voltage (VRRM) of the S2K?

The S2K has a VRRM rating of 800 V, confirmed in the Absolute Maximum Ratings table of Taiwan Semiconductor's N2102 datasheet. This value defines the highest instantaneous reverse voltage the device can block repeatedly without breakdown. The S2K's 800 V rating makes it suitable for 230 VAC input applications with sufficient safety margin, and this specification is measured under standard test conditions (TA = 25°C).

Does the S2K have a specified reverse recovery time (trr), and what is its value?

Yes, the S2K has a specified reverse recovery time of 1500 ns, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A conditions. This trr value reflects its standard recovery behavior - appropriate for line-frequency and medium-frequency (<100 kHz) rectification. The S2K is not optimized for high-speed switching, and its trr is significantly longer than ultrafast or Schottky alternatives, which is consistent with its role as a rugged, low-cost general-purpose rectifier.

What package type does the S2K use, and is it compatible with automated assembly?

The S2K uses the DO-214AA (SMB) surface-mount package, with matte tin-plated leads and moisture sensitivity level 1 per J-STD-020. Its standardized footprint and lead geometry are fully compatible with high-speed automated placement equipment, supporting throughput rates exceeding 20,000 components per hour. The S2K's SMB package also enables efficient thermal transfer to PCB copper, and its UL 94V-0 molding compound meets flammability requirements for end-product safety certifications.

What is the forward voltage drop (VF) of the S2K at rated current?

The S2K has a maximum forward voltage drop of 1.15 V at IF = 2 A and TJ = 25°C, as specified in the Electrical Specifications table. This VF value directly impacts conduction losses in power circuits - for example, contributing approximately 2.3 W of dissipation in a full-wave bridge at full load. The S2K's VF remains stable across temperature, and its glass-passivated junction helps maintain consistency over time and environmental stress.

Is the S2K RoHS compliant and halogen-free?

Yes, the S2K is RoHS compliant and halogen-free in accordance with IEC 61249-2-21. Taiwan Semiconductor explicitly states both compliance attributes in the Features section of the N2102 datasheet. These certifications confirm that the S2K contains no restricted substances above threshold limits and uses chlorine- and bromine-free flame retardants in its molding compound - satisfying environmental and regulatory requirements for global electronics manufacturing and end-of-life disposal.